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Re: [Xen-devel] [PATCH 1/1] PCI: Deletion of unnecessary checks before three function calls



On Sun, Nov 02, 2014 at 04:12:30PM +0100, SF Markus Elfring wrote:
> The functions pci_dev_put(), pci_pme_wakeup_bus() and put_device() test
> whether their argument is NULL and then return immediately. Thus the test
> around the call is not needed.
> 
> This issue was detected by using the Coccinelle software.
> 
> Signed-off-by: Markus Elfring <elfring@xxxxxxxxxxxxxxxxxxxxx>

Applied to pci/misc for v3.19, thanks!

> ---
>  drivers/pci/pci-acpi.c     | 3 +--
>  drivers/pci/probe.c        | 3 +--
>  drivers/pci/search.c       | 3 +--
>  drivers/pci/xen-pcifront.c | 3 +--
>  4 files changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/pci/pci-acpi.c b/drivers/pci/pci-acpi.c
> index 37263b0..a8fe5de 100644
> --- a/drivers/pci/pci-acpi.c
> +++ b/drivers/pci/pci-acpi.c
> @@ -60,8 +60,7 @@ static void pci_acpi_wake_dev(struct work_struct *work)
>       pci_wakeup_event(pci_dev);
>       pm_runtime_resume(&pci_dev->dev);
> 
> -     if (pci_dev->subordinate)
> -             pci_pme_wakeup_bus(pci_dev->subordinate);
> +     pci_pme_wakeup_bus(pci_dev->subordinate);
>  }
> 
>  /**
> diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
> index 4170113..e93f16e 100644
> --- a/drivers/pci/probe.c
> +++ b/drivers/pci/probe.c
> @@ -86,8 +86,7 @@ static void release_pcibus_dev(struct device *dev)
>  {
>       struct pci_bus *pci_bus = to_pci_bus(dev);
> 
> -     if (pci_bus->bridge)
> -             put_device(pci_bus->bridge);
> +     put_device(pci_bus->bridge);
>       pci_bus_remove_resources(pci_bus);
>       pci_release_bus_of_node(pci_bus);
>       kfree(pci_bus);
> diff --git a/drivers/pci/search.c b/drivers/pci/search.c
> index 827ad83..2d806bd 100644
> --- a/drivers/pci/search.c
> +++ b/drivers/pci/search.c
> @@ -305,8 +305,7 @@ static struct pci_dev *pci_get_dev_by_id(const struct
> pci_device_id *id,
>                             match_pci_dev_by_id);
>       if (dev)
>               pdev = to_pci_dev(dev);
> -     if (from)
> -             pci_dev_put(from);
> +     pci_dev_put(from);
>       return pdev;
>  }
> 
> diff --git a/drivers/pci/xen-pcifront.c b/drivers/pci/xen-pcifront.c
> index 53df39a..46664cc 100644
> --- a/drivers/pci/xen-pcifront.c
> +++ b/drivers/pci/xen-pcifront.c
> @@ -596,8 +596,7 @@ static pci_ers_result_t pcifront_common_process(int cmd,
>       pcidev = pci_get_bus_and_slot(bus, devfn);
>       if (!pcidev || !pcidev->driver) {
>               dev_err(&pdev->xdev->dev, "device or AER driver is NULL\n");
> -             if (pcidev)
> -                     pci_dev_put(pcidev);
> +             pci_dev_put(pcidev);
>               return result;
>       }
>       pdrv = pcidev->driver;
> -- 
> 2.1.3
> 
> 

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